When I picture a TRUE signature move, I picture something that nobody else or few people do. I know people will disagree, but I don't consider it about the quality so much as the actual maneuver being attempted. Yes, V/T's twist is superior, but it's not a "signature" move. Same with things like Gold's/Kim's jumps or Kostner/Suzuki's footwork which are a quality thing more than a signature thing.

Yuzuru along with Javier are one of the only few current elites to execute clean 4S

I have to agree with CSG.

Yes, he can do beatifull 4S in practices, but still was struggling in competition so I don't see this as his signature, but definitely can see his 3A entry and his 4T, which for me me is the most beatifull and smoothest quad toe ever